Engine Wiring Harness Problems: Symptoms, Diagnosis, and Buying a Used OEM Replacement
A car that cranks but will not start is stressful. A car that starts, stalls, throws random codes, and then acts fine for ten minutes is worse. That is the kind of problem that makes people replace sensors, coils, batteries, and modules before they look at the part tying all of those pieces together: the engine wiring harness. The engine wiring harness is the organized bundle of wires and connectors that carries power and signals between the engine, sensors, ignition system, fuel system, alternator, transmission-related components, and engine control module. When it is healthy, you never think about it. When it is damaged, your car can feel haunted by electrical problems that do not point to one obvious part. The...